In general, the idea behind virtualization is to make many from one. As an example, from one physical server using virtualization software, multiple virtual machines can run as if each virtual machine were a separate physical box. In data centers, before virtualization, one or more applications and an operating system would run on their own unique physical server. Since each one of those physical servers needed floor or rack space, there was a problem of the growing size and number of data centers that businesses needed in IT. As more and more physical servers were added to run the ever growing number of virtual machines, this led to “data center sprawl.” Using virtualization to consolidate the number of physical servers reversed the trend of data center sprawl, and companies began to see a cost savings.
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